Improvement in steam-generator safety-valves



UNITED STATES PATENT OEEIGE.

STEPHEN STUGKY, OF NEW ALBANY, INDIANA.

IMPROVEMENT IN STEAM-GENERATOR SAFETY-VALVES.

Specification forming part ofLetters Patent No. 57,993, dated September11, 1866.

To alt 'whom it may concer-n.'

Be it known that I, STEPHEN STUCKY, of New Albany, in the county ofFloyd and State ot' Indiana, have invented certain new and usefulImprovements in Safetyvalves; and I do hereby declare that the followingis a full, clear, and exact description of the same, reference being hadto the accompanying drawings, and the letters of reference markedthereon, making a part of this specification.

In the annexed drawings, A represents the valve-box, which is made ofcast-iron, in the form shown, and circular on the under side to litsnugly upon the boiler.

Within the valve-box is constructed a smaller box, E, into which isplaced the valve, and through which the steam passes.

C represents the valve. This valve is cast in the forni shown, ot onepiece of metal, and is placed at the forward portion of the box F, withone portion within and a small portion ofthe same resting upon the outerside of said box. In the construction of this valve it will be seen thatthe upper portion is upon the valve-seat z, and markedfz, and is ofgreater circumference and weight than the lower portion7 marked l), uponthe valve-seat fr.

D represents a lever, which is pivoted to a small upright, It, at theforward end and upon the top of the box F. This lever extends over, andis secured to, the valve, as shown, and has a weight, E, attached to therea-rmost end of box A.

B is the inlet for the steam to pass to the valve, and is partitioned toprevent being tampered with. This valve is what is knownas abalance-valve, as the pressure of the steam is on top of one valve, b,and underneath the other, a. Bot-h valves being-on one rod, or beingcast of one piece of metal, so that all of the pressure exerted on thelower valve, l), is just that much weight subtracted from the standingweight E on end of lever D.

In the use of this valve it will be seen that over double the orifice isobtained through which the steam may escape, it being almost impossibleto explode a boiler with a valve of this kind with the same amount ofvalve surface that is at present used, and so much more opening for thesame-sized chamber. There a being very near a balance7 only enoughdeadweight is required to counterbalance the amount of area of the largevalve over that of the small one. Were the valve-disks a and b of equalsize and weight the pressure of the steam underneath the valve c and thepressure upon the top of valve b would be equal and the valve remainstationary; whereas in the present form and size ofthe valves, a sut'-cient weight is required tocounterbalance the difference in the twovalves.

G represents a perforated disk, which is placed in the throat, andthrough which the steam escapes. c is a guide-stem, which is cast v withthe valve, and is placed within a shorttube, di, in the bottom ofthe boxE, for the purpose of keeping the valves min their proper places. Thisvalve is firmly and securely covered with a suitable lid, which isbolted to the valve, and a chain passed through the links made in eachbolt, so that it would be impossible to tamper with the valve. The Valveherein described is placed upon the top of any of the boilers now inuse; but it is suggested to place the entire valve within the boiler forthose hereafter to be constructed.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

The valve-box A, provided with an inner box, F, valve C, and lever Dwith weight E, inlet B, and throat G, the whole being constructed andarranged in the manner substantially as and for the purpose herein setforth.-

As evidence that I claim the foregoing I have hereunto set my hand inthe presence of witnesses.

STEPHEN ST UGKY.

R. M. WEIR, T. F. J AcxsoN, DAVID WILKINSON.

